var fs = require('fs');

var inF = fs.readFileSync('./banmaxian.json', 'utf-8');
var inJson = JSON.parse(inF);

var features = inJson.features;

for (let i = 0; i < features.length; i++) {
    var aF = features[i];
    aF.properties.levels = 50.0;
}

console.log(features);

fs.writeFileSync('./outbanma.json', JSON.stringify(inJson));
